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Advisor check: MongoDB DBPATH mount

Description

This check warns if dbpath does not have a dedicated mount point.

Resolution

For tuning flexibility, Percona recommends that MongoDB data sit on its own disk volume, preferably with its own dedicated disks/RAID array. Since this may complicate backups, for best performance you can also dedicate a separate volume for the MongoDB journal. This will separate its disk activity noise from the main data set.

The journal does not have its own config/command-line setting yet. Therefore, you’ll need to mount a volume to the “journal” directory inside the dbPath. For example, “/var/lib/mongo/journal” would be the journal mount-path if the dbPath was set to “/var/lib/mongo”.

Using a separate mount point for the dbPath in MongoDB is recommended for the following reasons:

  • Performance: Separating the data files from the system files can help improve the performance of MongoDB. This is because the data files can be placed on a dedicated disk or disk partition, which can improve read and write performance.

  • Scalability: By separating the data files from the system files, scaling the database becomes easier. You can add more storage as needed without having to worry about running out of space on the system disk.

  • Maintenance: Separating the data files from the system files makes it easier to perform maintenance tasks such as backups and restores. You can back up the data files separately from the system files, which can help reduce the time it takes to perform backups and restores.

  • Security: By separating the data files from the system files, you can improve the security of your database. For example, you can restrict access to the data files to only those users who need it, which can help prevent unauthorized access to your data.

For more information on tuning your database, see the MongoDB Production Checklist.

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